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Adsorption mechanism of ReO$$_{4}$$$$^{-}$$ on Ni-Zn layered hydroxide salt and its application to removal of ReO$$_{4}$$$$^{-}$$ as a surrogate of TcO$$_{4}$$$$^{-}$$

Tanaka, Kazuya; Kozai, Naofumi; Yamasaki, Shinya*; Onuki, Toshihiko; Kaplan, D. I.*; Grambow, B.

In this study, Ni-Zn layered hydroxide salt (LHS) was used for adsorption experiments of ReO$$_{4}$$$$^{-}$$, as a surrogate of TcO$$_{4}$$$$^{-}$$, in aqueous solutions with various initial Re and sodium salt concentrations. The maximum adsorption amount of Re was estimated at 127.7 mg/g (6.86 $$times$$ 10$$^{-4}$$ eq/g) by fitting adsorption isotherm of ReO$$_{4}$$$$^{-}$$ to Langmuir plot. The adsorption of ReO$$_{4}$$$$^{-}$$ at neutral pH was a reversible process by anion exchange, and decreased with increasing Cl$$^{-}$$, NO$$_{3}$$$$^{-}$$ and SO$$_{4}$$$$^{2-}$$ in solution. EXAFS analysis indicated that ReO$$_{4}$$$$^{-}$$ was adsorbed as an outer-sphere complex on Ni-Zn LHS. The Ni-Zn LHS is a more robust adsorbent for ReO$$_{4}$$$$^{-}$$ than the Mg-Al LDH in terms of solution pH and tolerance to competing anions, and may be an effective alternative to the traditional and more limited method of removing aqueous TcO$$_{4}$$$$^{-}$$ by reductive precipitation.

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Category:Chemistry, Physical

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